Research papers and correspondence, 1982-1997, relating to the Montgomeryshire Place-Names Project, including map data entries and notes on place-names; material on etymology, 1981-1994, including correspondence and notes for talks and lectures; papers, 1971-1995, deriving from G. G. Evans's work as tutor at the Montgomeryshire College of Further Education; minutes, correspondence and papers, 1969-1996, relating to a large number of committees on which Evans served; miscellaneous correspondence and papers, 1953-1995, mainly concerning Evans's scholastic and writing work; and research notes and papers, relating to Evans's publications and other research projects.

An 'Index Locorum' or list of Montgomeryshire place-names, alphabetically arranged, with references to printed and manuscript sources.